simple_html_dom类，实际上明文函数返回什么 - simple_html_dom class, What actually plaintext function returns?

simple_html_dom class, What actually plaintext function returns?

我不明白。我试图解析一些html页面:

<select name="sel">
  <option value="val0">-please select me-</option>
  <option value="val1">some selection</option>
</select>

我使用Simple_html_dom类:

foreach($html->find('select') as $s) {
    if ($html->find('option',1) != false) {
      $tempoption = $html->find('option',1)->plaintext;
      echo $tempoption; //shows 'some selection'
    }
}

但是，如果我只使用这一行:

$value='';
if ( $tempoption == 'some selection')
   $value='79';
echo $value; //doesn't shows anything (empty variable?)
//or this one :
if ( strcmp($tempoption, 'some selection'))
   $value='79';
echo $value; //Nope.

我尝试了代码，就像你在那里一样，$value最终得到79。但是我认为你的HTML中一定有比这一小段更多的东西。在你的代码中，最突出的是我的事实，你是包装条件在一个循环，通过HTML的所有选择，但你没有利用的单个选择元素，你从循环中得到的，所以foreach循环似乎毫无意义。

看看这个:

foreach($html->find('select option') as $o) 
{
  $o_label = $o->plaintext;
  if($o_label=='some selection') echo 'PERFECT MATCH: '.$o_label."'n"; 
  else if(stripos($o_label, 'some selection')!==false) echo 'LOOSE MATCH: '.$o_label."'n"; 
  else echo 'DOES NOT MATCH: '.$o_label."'n";
}

当给定HTML:

<select name="sel">
  <option value="val0">-please select me-</option>
  <option value="val1">1 some selection</option>
  <option value="val1">This does not match</option>
  <option value="val1">some selection</option>
  <option value="val1">Another non-matching label</option>
  <option value="val1">some selection 3</option>
  <option value="val1">One more that does not match</option>
  <option value="val1">4 SoME sElEcTIon 4</option>
</select>

输出将是:

DOES NOT MATCH: -please select me-
LOOSE MATCH: 1 some selection
DOES NOT MATCH: This does not match
PERFECT MATCH: some selection
DOES NOT MATCH: Another non-matching label
LOOSE MATCH: some selection 3
DOES NOT MATCH: One more that does not match
LOOSE MATCH: 4 SoME sElEcTIon 4